what it is, is that the fan manangement part of OS 9/X hasnt cut in yet. Therefore the fan is running at full speed according to the BIOS (yes macs have em). When OS 9/X starts up then it gets the data from the fan control chip and adjusts the fan speed according to what the temperature sensors in the motherboard tell it.

The latest PM G$ firmware update fixes this almost entirely.

I cant tell you now how effective it is as i hav o/clocked my G4 to a DP 1ghz.

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